ECW with alpha channel. How to change transparent?
buyslake
Global Mapper User
Hello,
I created an ECW image with an alpha channel so I can turn the black area around the image transparent.
I do not see any option within Global Mapper to set the alpha channel transparent.
Please advise...
I created an ECW image with an alpha channel so I can turn the black area around the image transparent.
I do not see any option within Global Mapper to set the alpha channel transparent.
Please advise...
Comments
-
What version of Global Mapper are you using? When you load an ECW file with an alpha channel it should automatically be detected (or depending on how it is marked in the file you might be prompted to treat it as data or alpha) and used as an alpha. What are you using to create the ECW file?
Thanks,
Mike
Global Mapper Support
support@globalmapper.com -
global_mapper wrote: »What version of Global Mapper are you using? When you load an ECW file with an alpha channel it should automatically be detected (or depending on how it is marked in the file you might be prompted to treat it as data or alpha) and used as an alpha. What are you using to create the ECW file?
Thanks,
Mike
Global Mapper Support
support@globalmapper.com
Version 13
The ECW was created with Erdas Imagine with the ECW transparency option.
The ECW when viewed in ArcMap 10 first appears with the black border around the image. (the ecw image is an odd shape, Not square)
In Arcmap, you can turn the alpha channel transparent. Then you only see the image. I was looking for this option in Global Mapper. -
The alpha channel should automatically be treated as transparent. If you load the generated ECW into Global Mapper is the edge transparent? There is only an option to ignore an alpha channel since it will automatically be transparent.
Thanks,
Mike
Global Mapper Support
support@globalmapper.com
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